* Update issue templates to issue forms
* Add language around GH discussions vs the forum
* Create a SUPPORT doc
* Add a couple badges to the README
* Update Code of Conduct
Absolute paths in links end up being rooted at github.com.
The contributing guidelines link is broken unless we use the full URL.
Also, remove superfluous "monospace formatting" for the link.
Pushes to master and stable branches will result in buildbot-like checks
on multiple OSes and architectures.
Pull requests will be checked on a public Ubuntu GitHub runner.
